This study was conducted on the poplar bug that infects different plant families, especially the trees of the willow family, including the trees included in our study, which are the black poplar (P. nigra), the Euphrates poplar (P. euphratica), the willow (Salix sp.) during the study year for the period between 5/15/2021 until 9/15/2021, The study included the sensitivity of two types of poplar trees and willow trees to the infestation of poplar bugs. The presence of the insect nymphs was observed on the study trees from mid-May to mid-September of the study season. It was found from the study that the highest average number of nymphs was in black poplar and reached 19.55 nymphs/leaf in mid-July at a temperature of 42°C and a relative humidity of 28%. While the lowest average number of nymphs in Euphrates poplar was 0 nymph/leaf at the end of August at a temperature of 45°C and relative humidity of 26%. Since the nymphs prefer the warmer interface compared to the less warm interfaces, the average number of nymphs in the black poplar, Euphrates poplar and willow and for the eastern side is 14.498 nymphs/leaf, 5.271 nymphs/leaf, and 3.453 nymphs/leaf, respectively and to the north, 4,640 nymphs/leaf, 2.249 nymphs / leaf, 1.822 nymphs / leaf, respectively.